I noticed the little fingerlike projection on the bottom of this shell a few weeks ago. It may have gotten a little bit larger but not by much. It does not move. A hermit crab even moved the shell around a little, turned it upside down but didn't knock it off. On the rock in the back of the tank (other pics) there are 3 (1 a little away from the other 2) that looks similar- not quite as pointed. I removed an LED light @a week ago and am having to use an old light until my new reef capable LED light comes in... could be why the little thing on the shell has not grown any... maybe? Anyway, I'm very curious about what this is. Also, what is the bright green spot (a couple of red ones are around the 1 green spot) that has popped up on the shell? All of a sudden one day, this bland little shell started becoming colorful and got this little projection. Please inform if you have any ideas. Thanks
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